This book comprises a collection of chapters describing topics from traditional radiation cytogenetic analysis methods to the modern fluorescence based-analysis and high throughput automatic analysis methods. Cytogenetic analysis is important not only in order to understand radiation-induced DNA damage in cells, but it is also a standard biological method to estimate human radiation exposure in the radiation accidents. Therefore, we prepared a series of chapters not only covering biological aspects but also exploring radiation physics and radiation protection. Written for the highly successful Methods in Molecular Biology series, chapters include introductions to their respective topics, lists of the necessary materials and equipment, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls.